[Amps] 500 uh plate choke

Rob Atkinson ranchorobbo at gmail.com
Thu Jan 24 10:06:11 EST 2013

Thanks John, but I can't take credit for this--I got the idea from a
page on W8JI's website and I should have credited him initially but I
was in a hurry and didn't think to do that.



On Thu, Jan 24, 2013 at 6:34 AM, John Lyles <jtml at losalamos.com> wrote:
> K5UJ posted a really great idea to test an RF Choke for resonances, without
> needing even a GDO, (although every ham should still have one of these - in
> addition to an Almost All Digital L/C IIB meter!). Hams come up with the
> greatest ideas for simple methods of doing complex measurements with little
> expense, this forum remains the best!
> 73
> John
> ---------
> Message: 6
> Date: Tue, 22 Jan 2013 17:30:04 -0600
> From: Rob Atkinson <ranchorobbo at gmail.com>
> To: Vic K2VCO <k2vco.vic at gmail.com>
> Cc: Amps reflector <amps at contesting.com>
> you can test your chokes yourself.  Get a modern solid state ham rig
> and fix it so it puts out around 20 watts cw.  dump the RF into a 50
> ohm resistor and put a T in the line.  Connect the stem of the T to
> the choke; the cold end of the choke connect to a 5 or 10 watt
> incandescent lamp shunted to the feed shield.  if you have a scope put
> it in the line with the lamp using a feedline probe.  Spin the VFO on
> the rig across all the bands and see if you see the lamp light or any
> RF on the scope trace.
> Rob
> K5UJ
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